1 /*****************************************************************************
2 * update_crypto.c: DSA related functions used for updating
3 *****************************************************************************
4 * Copyright © 2008-2009 VLC authors and VideoLAN
7 * Authors: Rafaël Carré <funman@videolanorg>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License as published by
11 * the Free Software Foundation; either release 2 of the License, or
12 * (at your option) any later release.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
26 * This file contains functions related to OpenPGP in VLC update management
29 /*****************************************************************************
31 *****************************************************************************/
42 #include "vlc_common.h"
43 #include <vlc_stream.h>
44 #include <vlc_strings.h>
50 /*****************************************************************************
52 *****************************************************************************/
54 #define packet_type( c ) ( ( c & 0x3c ) >> 2 ) /* 0x3C = 00111100 */
55 #define packet_header_len( c ) ( ( c & 0x03 ) + 1 ) /* number of bytes in a packet header */
58 static inline int scalar_number( const uint8_t *p, int header_len )
60 assert( header_len == 1 || header_len == 2 || header_len == 4 );
64 else if( header_len == 2 )
65 return( (p[0] << 8) + p[1] );
66 else if( header_len == 4 )
67 return( (p[0] << 24) + (p[1] << 16) + (p[2] << 8) + p[3] );
73 /* number of data bytes in a MPI */
74 static int mpi_len(const uint8_t *mpi)
76 return (scalar_number(mpi, 2) + 7) / 8;
79 static size_t read_mpi(uint8_t *dst, const uint8_t *buf, size_t buflen, size_t bits)
84 size_t n = mpi_len(buf);
98 #define READ_MPI(d, bits) do { \
99 size_t n = read_mpi(d, p_buf, i_packet_len - i_read, bits); \
100 if (!n) goto error; \
106 * fill a public_key_packet_t structure from public key packet data
107 * verify that it is a version 4 public key packet, using DSA
109 static int parse_public_key_packet( public_key_packet_t *p_key,
110 const uint8_t *p_buf, size_t i_packet_len )
112 if( i_packet_len < 6 )
117 p_key->version = *p_buf++; i_read++;
118 if( p_key->version != 4 )
121 /* XXX: warn when timestamp is > date ? */
122 memcpy( p_key->timestamp, p_buf, 4 ); p_buf += 4; i_read += 4;
124 p_key->algo = *p_buf++; i_read++;
125 if( p_key->algo != GCRY_PK_DSA )
128 READ_MPI(p_key->p, 3072);
129 READ_MPI(p_key->q, 256);
130 READ_MPI(p_key->g, 3072);
131 READ_MPI(p_key->y, 3072);
133 if( i_read == i_packet_len )
136 /* some extra data eh ? */
143 static size_t parse_signature_v3_packet( signature_packet_t *p_sig,
144 const uint8_t *p_buf, size_t i_sig_len )
146 size_t i_read = 1; /* we already read the version byte */
148 if( i_sig_len < 19 ) /* signature is at least 19 bytes + the 2 MPIs */
151 p_sig->specific.v3.hashed_data_len = *p_buf++; i_read++;
152 if( p_sig->specific.v3.hashed_data_len != 5 )
155 p_sig->type = *p_buf++; i_read++;
157 memcpy( p_sig->specific.v3.timestamp, p_buf, 4 );
158 p_buf += 4; i_read += 4;
160 memcpy( p_sig->issuer_longid, p_buf, 8 );
161 p_buf += 8; i_read += 8;
163 p_sig->public_key_algo = *p_buf++; i_read++;
165 p_sig->digest_algo = *p_buf++; i_read++;
167 p_sig->hash_verification[0] = *p_buf++; i_read++;
168 p_sig->hash_verification[1] = *p_buf++; i_read++;
170 assert( i_read == 19 );
177 * fill a signature_packet_v4_t from signature packet data
178 * verify that it was used with a DSA public key
180 static size_t parse_signature_v4_packet( signature_packet_t *p_sig,
181 const uint8_t *p_buf, size_t i_sig_len )
183 size_t i_read = 1; /* we already read the version byte */
185 if( i_sig_len < 10 ) /* signature is at least 10 bytes + the 2 MPIs */
188 p_sig->type = *p_buf++; i_read++;
190 p_sig->public_key_algo = *p_buf++; i_read++;
192 p_sig->digest_algo = *p_buf++; i_read++;
194 memcpy( p_sig->specific.v4.hashed_data_len, p_buf, 2 );
195 p_buf += 2; i_read += 2;
197 size_t i_hashed_data_len =
198 scalar_number( p_sig->specific.v4.hashed_data_len, 2 );
199 i_read += i_hashed_data_len;
200 if( i_read + 4 > i_sig_len )
203 p_sig->specific.v4.hashed_data = (uint8_t*) malloc( i_hashed_data_len );
204 if( !p_sig->specific.v4.hashed_data )
206 memcpy( p_sig->specific.v4.hashed_data, p_buf, i_hashed_data_len );
207 p_buf += i_hashed_data_len;
209 memcpy( p_sig->specific.v4.unhashed_data_len, p_buf, 2 );
210 p_buf += 2; i_read += 2;
212 size_t i_unhashed_data_len =
213 scalar_number( p_sig->specific.v4.unhashed_data_len, 2 );
214 i_read += i_unhashed_data_len;
215 if( i_read + 2 > i_sig_len )
218 p_sig->specific.v4.unhashed_data = (uint8_t*) malloc( i_unhashed_data_len );
219 if( !p_sig->specific.v4.unhashed_data )
222 memcpy( p_sig->specific.v4.unhashed_data, p_buf, i_unhashed_data_len );
223 p_buf += i_unhashed_data_len;
225 memcpy( p_sig->hash_verification, p_buf, 2 );
226 p_buf += 2; i_read += 2;
228 uint8_t *p, *max_pos;
229 p = p_sig->specific.v4.unhashed_data;
230 max_pos = p + scalar_number( p_sig->specific.v4.unhashed_data_len, 2 );
237 size_t i_subpacket_len;
240 if( p + 1 > max_pos )
242 i_subpacket_len = *p++;
246 if( p + 2 > max_pos )
248 i_subpacket_len = (*p++ - 192) << 8;
249 i_subpacket_len += *p++ + 192;
253 if( p + 4 > max_pos )
255 i_subpacket_len = *++p << 24;
256 i_subpacket_len += *++p << 16;
257 i_subpacket_len += *++p << 8;
258 i_subpacket_len += *++p;
261 if( *p == ISSUER_SUBPACKET )
263 if( p + 9 > max_pos )
266 memcpy( &p_sig->issuer_longid, p+1, 8 );
271 p += i_subpacket_len;
276 static int parse_signature_packet( signature_packet_t *p_sig,
277 const uint8_t *p_buf, size_t i_packet_len )
279 if( !i_packet_len ) /* 1st sanity check, we need at least the version */
282 p_sig->version = *p_buf++;
285 switch( p_sig->version )
288 i_read = parse_signature_v3_packet( p_sig, p_buf, i_packet_len );
291 p_sig->specific.v4.hashed_data = NULL;
292 p_sig->specific.v4.unhashed_data = NULL;
293 i_read = parse_signature_v4_packet( p_sig, p_buf, i_packet_len );
299 if( i_read == 0 ) /* signature packet parsing has failed */
302 if( p_sig->public_key_algo != GCRY_PK_DSA )
305 switch( p_sig->type )
307 case BINARY_SIGNATURE:
309 case GENERIC_KEY_SIGNATURE:
310 case PERSONA_KEY_SIGNATURE:
311 case CASUAL_KEY_SIGNATURE:
312 case POSITIVE_KEY_SIGNATURE:
318 p_buf--; /* rewind to the version byte */
321 READ_MPI(p_sig->r, 256);
322 READ_MPI(p_sig->s, 256);
324 assert( i_read == i_packet_len );
325 if( i_read < i_packet_len ) /* some extra data, hm ? */
332 if( p_sig->version == 4 )
334 free( p_sig->specific.v4.hashed_data );
335 free( p_sig->specific.v4.unhashed_data );
343 * crc_octets() was lamely copied from rfc 2440
344 * Copyright (C) The Internet Society (1998). All Rights Reserved.
346 #define CRC24_INIT 0xB704CEL
347 #define CRC24_POLY 0x1864CFBL
349 static long crc_octets( uint8_t *octets, size_t len )
351 long crc = CRC24_INIT;
355 crc ^= (*octets++) << 16;
356 for (i = 0; i < 8; i++)
363 return crc & 0xFFFFFFL;
368 * Transform an armored document in binary format
369 * Used on public keys and signatures
371 static int pgp_unarmor( const char *p_ibuf, size_t i_ibuf_len,
372 uint8_t *p_obuf, size_t i_obuf_len )
374 const char *p_ipos = p_ibuf;
375 uint8_t *p_opos = p_obuf;
377 int i_header_skipped = 0;
379 while( !i_end && p_ipos < p_ibuf + i_ibuf_len && *p_ipos != '=' )
381 if( *p_ipos == '\r' || *p_ipos == '\n' )
387 size_t i_line_len = strcspn( p_ipos, "\r\n" );
388 if( i_line_len == 0 )
391 if( !i_header_skipped )
393 if( !strncmp( p_ipos, "-----BEGIN PGP", 14 ) )
394 i_header_skipped = 1;
396 p_ipos += i_line_len + 1;
400 if( !strncmp( p_ipos, "Version:", 8 ) )
402 p_ipos += i_line_len + 1;
406 if( p_ipos[i_line_len - 1] == '=' )
411 p_opos += vlc_b64_decode_binary_to_buffer( p_opos,
412 p_obuf - p_opos + i_obuf_len, p_ipos );
413 p_ipos += i_line_len + 1;
416 /* XXX: the CRC is OPTIONAL, really require it ? */
417 if( p_ipos + 5 > p_ibuf + i_ibuf_len || *p_ipos++ != '=' )
421 if( vlc_b64_decode_binary_to_buffer( p_crc, 3, p_ipos ) != 3 )
424 long l_crc = crc_octets( p_obuf, p_opos - p_obuf );
425 long l_crc2 = ( 0 << 24 ) + ( p_crc[0] << 16 ) + ( p_crc[1] << 8 ) + p_crc[2];
427 return l_crc2 == l_crc ? p_opos - p_obuf : 0;
432 * Verify an OpenPGP signature made with some DSA public key
434 int verify_signature( signature_packet_t *sign, public_key_packet_t *p_key,
437 /* the data to be verified (a hash) */
438 const char *hash_sexp_s = "(data(flags raw)(value %m))";
440 const char *key_sexp_s = "(public-key(dsa(p %m)(q %m)(g %m)(y %m)))";
442 const char *sig_sexp_s = "(sig-val(dsa(r %m )(s %m )))";
445 gcry_mpi_t p, q, g, y, r, s, hash;
446 p = q = g = y = r = s = hash = NULL;
447 gcry_sexp_t key_sexp, hash_sexp, sig_sexp;
448 key_sexp = hash_sexp = sig_sexp = NULL;
450 int i_p_len = mpi_len( p_key->p );
451 int i_q_len = mpi_len( p_key->q );
452 int i_g_len = mpi_len( p_key->g );
453 int i_y_len = mpi_len( p_key->y );
454 if( gcry_mpi_scan( &p, GCRYMPI_FMT_USG, p_key->p + 2, i_p_len, NULL ) ||
455 gcry_mpi_scan( &q, GCRYMPI_FMT_USG, p_key->q + 2, i_q_len, NULL ) ||
456 gcry_mpi_scan( &g, GCRYMPI_FMT_USG, p_key->g + 2, i_g_len, NULL ) ||
457 gcry_mpi_scan( &y, GCRYMPI_FMT_USG, p_key->y + 2, i_y_len, NULL ) ||
458 gcry_sexp_build( &key_sexp, &erroff, key_sexp_s, p, q, g, y ) )
461 uint8_t *p_r = sign->r;
462 uint8_t *p_s = sign->s;
463 int i_r_len = mpi_len( p_r );
464 int i_s_len = mpi_len( p_s );
465 if( gcry_mpi_scan( &r, GCRYMPI_FMT_USG, p_r + 2, i_r_len, NULL ) ||
466 gcry_mpi_scan( &s, GCRYMPI_FMT_USG, p_s + 2, i_s_len, NULL ) ||
467 gcry_sexp_build( &sig_sexp, &erroff, sig_sexp_s, r, s ) )
470 int i_hash_len = gcry_md_get_algo_dlen (sign->digest_algo);
471 if (sign->public_key_algo == GCRY_PK_DSA) {
472 if (i_hash_len > i_q_len)
473 i_hash_len = i_q_len;
475 if( gcry_mpi_scan( &hash, GCRYMPI_FMT_USG, p_hash, i_hash_len, NULL ) ||
476 gcry_sexp_build( &hash_sexp, &erroff, hash_sexp_s, hash ) )
479 if( gcry_pk_verify( sig_sexp, hash_sexp, key_sexp ) )
485 if( p ) gcry_mpi_release( p );
486 if( q ) gcry_mpi_release( q );
487 if( g ) gcry_mpi_release( g );
488 if( y ) gcry_mpi_release( y );
489 if( r ) gcry_mpi_release( r );
490 if( s ) gcry_mpi_release( s );
491 if( hash ) gcry_mpi_release( hash );
492 if( key_sexp ) gcry_sexp_release( key_sexp );
493 if( sig_sexp ) gcry_sexp_release( sig_sexp );
494 if( hash_sexp ) gcry_sexp_release( hash_sexp );
500 * fill a public_key_t with public key data, including:
501 * * public key packet
502 * * signature packet issued by key which long id is p_sig_issuer
505 int parse_public_key( const uint8_t *p_key_data, size_t i_key_len,
506 public_key_t *p_key, const uint8_t *p_sig_issuer )
508 const uint8_t *pos = p_key_data;
509 const uint8_t *max_pos = pos + i_key_len;
512 #define PUBLIC_KEY_FOUND 0x01
513 #define USER_ID_FOUND 0x02
514 #define SIGNATURE_FOUND 0X04
516 uint8_t *p_key_unarmored = NULL;
518 p_key->psz_username = NULL;
519 p_key->sig.specific.v4.hashed_data = NULL;
520 p_key->sig.specific.v4.unhashed_data = NULL;
522 if( !( *pos & 0x80 ) )
523 { /* first byte is ASCII, unarmoring */
524 p_key_unarmored = (uint8_t*)malloc( i_key_len );
525 if( !p_key_unarmored )
527 int i_len = pgp_unarmor( (char*)p_key_data, i_key_len,
528 p_key_unarmored, i_key_len );
533 pos = p_key_unarmored;
534 max_pos = pos + i_len;
537 while( pos < max_pos )
539 if( !(*pos & 0x80) || *pos & 0x40 )
542 int i_type = packet_type( *pos );
544 int i_header_len = packet_header_len( *pos++ );
545 if( pos + i_header_len > max_pos ||
546 ( i_header_len != 1 && i_header_len != 2 && i_header_len != 4 ) )
549 int i_packet_len = scalar_number( pos, i_header_len );
552 if( pos + i_packet_len > max_pos )
557 case PUBLIC_KEY_PACKET:
558 i_status |= PUBLIC_KEY_FOUND;
559 if( parse_public_key_packet( &p_key->key, pos, i_packet_len ) != VLC_SUCCESS )
563 case SIGNATURE_PACKET: /* we accept only v4 signatures here */
564 if( i_status & SIGNATURE_FOUND || !p_sig_issuer )
566 int i_ret = parse_signature_packet( &p_key->sig, pos,
568 if( i_ret == VLC_SUCCESS )
570 if( p_key->sig.version != 4 )
572 if( memcmp( p_key->sig.issuer_longid, p_sig_issuer, 8 ) )
574 free( p_key->sig.specific.v4.hashed_data );
575 free( p_key->sig.specific.v4.unhashed_data );
576 p_key->sig.specific.v4.hashed_data = NULL;
577 p_key->sig.specific.v4.unhashed_data = NULL;
580 i_status |= SIGNATURE_FOUND;
585 if( p_key->psz_username ) /* save only the first User ID */
587 i_status |= USER_ID_FOUND;
588 p_key->psz_username = (uint8_t*)malloc( i_packet_len + 1);
589 if( !p_key->psz_username )
592 memcpy( p_key->psz_username, pos, i_packet_len );
593 p_key->psz_username[i_packet_len] = '\0';
601 free( p_key_unarmored );
603 if( !( i_status & ( PUBLIC_KEY_FOUND | USER_ID_FOUND ) ) )
606 if( p_sig_issuer && !( i_status & SIGNATURE_FOUND ) )
612 if( p_key->sig.version == 4 )
614 free( p_key->sig.specific.v4.hashed_data );
615 free( p_key->sig.specific.v4.unhashed_data );
617 free( p_key->psz_username );
618 free( p_key_unarmored );
623 /* hash a binary file */
624 static int hash_from_binary_file( const char *psz_file, gcry_md_hd_t hd )
626 uint8_t buffer[4096];
629 FILE *f = vlc_fopen( psz_file, "r" );
633 while( ( i_read = fread( buffer, 1, sizeof(buffer), f ) ) > 0 )
634 gcry_md_write( hd, buffer, i_read );
642 /* final part of the hash */
643 static uint8_t *hash_finish( gcry_md_hd_t hd, signature_packet_t *p_sig )
645 if( p_sig->version == 3 )
647 gcry_md_putc( hd, p_sig->type );
648 gcry_md_write( hd, &p_sig->specific.v3.timestamp, 4 );
650 else if( p_sig->version == 4 )
652 gcry_md_putc( hd, p_sig->version );
653 gcry_md_putc( hd, p_sig->type );
654 gcry_md_putc( hd, p_sig->public_key_algo );
655 gcry_md_putc( hd, p_sig->digest_algo );
656 gcry_md_write( hd, p_sig->specific.v4.hashed_data_len, 2 );
657 size_t i_len = scalar_number( p_sig->specific.v4.hashed_data_len, 2 );
658 gcry_md_write( hd, p_sig->specific.v4.hashed_data, i_len );
660 gcry_md_putc( hd, 0x04 );
661 gcry_md_putc( hd, 0xFF );
663 i_len += 6; /* hashed data + 6 bytes header */
665 gcry_md_putc( hd, (i_len >> 24) & 0xff );
666 gcry_md_putc( hd, (i_len >> 16) & 0xff );
667 gcry_md_putc( hd, (i_len >> 8) & 0xff );
668 gcry_md_putc( hd, (i_len) & 0xff );
671 { /* RFC 4880 only tells about versions 3 and 4 */
677 uint8_t *p_tmp = (uint8_t*) gcry_md_read( hd, p_sig->digest_algo) ;
678 unsigned int hash_len = gcry_md_get_algo_dlen (p_sig->digest_algo);
679 uint8_t *p_hash = malloc(hash_len);
681 memcpy(p_hash, p_tmp, hash_len);
688 * return a hash of a text
690 uint8_t *hash_from_text( const char *psz_string,
691 signature_packet_t *p_sig )
694 if( gcry_md_open( &hd, p_sig->digest_algo, 0 ) )
697 if( p_sig->type == TEXT_SIGNATURE )
700 size_t i_len = strcspn( psz_string, "\r\n" );
704 gcry_md_write( hd, psz_string, i_len );
707 gcry_md_putc( hd, '\r' );
708 gcry_md_putc( hd, '\n' );
710 if( *psz_string == '\r' )
712 if( *psz_string == '\n' )
716 gcry_md_write( hd, psz_string, strlen( psz_string ) );
718 return hash_finish( hd, p_sig );
723 * return a hash of a file
725 uint8_t *hash_from_file( const char *psz_file, signature_packet_t *p_sig )
728 if( gcry_md_open( &hd, p_sig->digest_algo, 0 ) )
731 if( hash_from_binary_file( psz_file, hd ) < 0 )
737 return hash_finish( hd, p_sig );
742 * Generate a hash on a public key, to verify a signature made on that hash
743 * Note that we need the signature (v4) to compute the hash
745 uint8_t *hash_from_public_key( public_key_t *p_pkey )
747 if( p_pkey->sig.version != 4 )
750 if( p_pkey->sig.type < GENERIC_KEY_SIGNATURE ||
751 p_pkey->sig.type > POSITIVE_KEY_SIGNATURE )
754 gcry_error_t error = 0;
757 error = gcry_md_open( &hd, p_pkey->sig.digest_algo, 0 );
761 gcry_md_putc( hd, 0x99 );
763 size_t i_p_len = mpi_len( p_pkey->key.p );
764 size_t i_g_len = mpi_len( p_pkey->key.g );
765 size_t i_q_len = mpi_len( p_pkey->key.q );
766 size_t i_y_len = mpi_len( p_pkey->key.y );
768 size_t i_size = 6 + 2*4 + i_p_len + i_g_len + i_q_len + i_y_len;
770 gcry_md_putc( hd, (i_size >> 8) & 0xff );
771 gcry_md_putc( hd, i_size & 0xff );
773 gcry_md_putc( hd, p_pkey->key.version );
774 gcry_md_write( hd, p_pkey->key.timestamp, 4 );
775 gcry_md_putc( hd, p_pkey->key.algo );
777 gcry_md_write( hd, (uint8_t*)&p_pkey->key.p, 2 );
778 gcry_md_write( hd, (uint8_t*)&p_pkey->key.p + 2, i_p_len );
780 gcry_md_write( hd, (uint8_t*)&p_pkey->key.q, 2 );
781 gcry_md_write( hd, (uint8_t*)&p_pkey->key.q + 2, i_q_len );
783 gcry_md_write( hd, (uint8_t*)&p_pkey->key.g, 2 );
784 gcry_md_write( hd, (uint8_t*)&p_pkey->key.g + 2, i_g_len );
786 gcry_md_write( hd, (uint8_t*)&p_pkey->key.y, 2 );
787 gcry_md_write( hd, (uint8_t*)&p_pkey->key.y + 2, i_y_len );
789 gcry_md_putc( hd, 0xb4 );
791 size_t i_len = strlen((char*)p_pkey->psz_username);
793 gcry_md_putc( hd, (i_len >> 24) & 0xff );
794 gcry_md_putc( hd, (i_len >> 16) & 0xff );
795 gcry_md_putc( hd, (i_len >> 8) & 0xff );
796 gcry_md_putc( hd, (i_len) & 0xff );
798 gcry_md_write( hd, p_pkey->psz_username, i_len );
800 uint8_t *p_hash = hash_finish( hd, &p_pkey->sig );
802 p_hash[0] != p_pkey->sig.hash_verification[0] ||
803 p_hash[1] != p_pkey->sig.hash_verification[1] )
814 * download a public key (the last one) from videolan server, and parse it
816 public_key_t *download_key( vlc_object_t *p_this,
817 const uint8_t *p_longid, const uint8_t *p_signature_issuer )
820 if( asprintf( &psz_url, "http://download.videolan.org/pub/keys/%.2X%.2X%.2X%.2X%.2X%.2X%.2X%.2X.asc",
821 p_longid[0], p_longid[1], p_longid[2], p_longid[3],
822 p_longid[4], p_longid[5], p_longid[6], p_longid[7] ) == -1 )
825 stream_t *p_stream = stream_UrlNew( p_this, psz_url );
830 int64_t i_size = stream_Size( p_stream );
833 stream_Delete( p_stream );
837 uint8_t *p_buf = (uint8_t*)malloc( i_size );
840 stream_Delete( p_stream );
844 int i_read = stream_Read( p_stream, p_buf, (int)i_size );
845 stream_Delete( p_stream );
847 if( i_read != (int)i_size )
849 msg_Dbg( p_this, "Couldn't read full GPG key" );
854 public_key_t *p_pkey = (public_key_t*) malloc( sizeof( public_key_t ) );
861 memcpy( p_pkey->longid, p_longid, 8 );
863 int i_error = parse_public_key( p_buf, i_read, p_pkey, p_signature_issuer );
866 if( i_error != VLC_SUCCESS )
868 msg_Dbg( p_this, "Couldn't parse GPG key" );
878 * Download the signature associated to a document or a binary file.
879 * We're given the file's url, we just append ".asc" to it and download
881 int download_signature( vlc_object_t *p_this, signature_packet_t *p_sig,
882 const char *psz_url )
884 char *psz_sig = (char*) malloc( strlen( psz_url ) + 4 + 1 ); /* ".asc" + \0 */
888 strcpy( psz_sig, psz_url );
889 strcat( psz_sig, ".asc" );
891 stream_t *p_stream = stream_UrlNew( p_this, psz_sig );
897 int64_t i_size = stream_Size( p_stream );
899 msg_Dbg( p_this, "Downloading signature (%"PRId64" bytes)", i_size );
900 uint8_t *p_buf = (uint8_t*)malloc( i_size );
903 stream_Delete( p_stream );
907 int i_read = stream_Read( p_stream, p_buf, (int)i_size );
909 stream_Delete( p_stream );
911 if( i_read != (int)i_size )
914 "Couldn't download full signature (only %d bytes)", i_read );
919 if( (uint8_t)*p_buf < 0x80 ) /* ASCII */
921 msg_Dbg( p_this, "Unarmoring signature" );
923 uint8_t* p_unarmored = (uint8_t*) malloc( ( i_size * 3 ) / 4 + 1 );
930 int i_bytes = pgp_unarmor( (char*)p_buf, i_size, p_unarmored, i_size );
939 msg_Dbg( p_this, "Unarmoring failed : corrupted signature ?" );
944 if( packet_type( *p_buf ) != SIGNATURE_PACKET )
946 msg_Dbg( p_this, "Not a signature: %d", *p_buf );
951 size_t i_header_len = packet_header_len( *p_buf );
952 if( ( i_header_len != 1 && i_header_len != 2 && i_header_len != 4 ) ||
953 i_header_len + 1 > (size_t)i_size )
956 msg_Dbg( p_this, "Invalid signature packet header" );
960 size_t i_len = scalar_number( p_buf+1, i_header_len );
961 if( i_len + i_header_len + 1 != (size_t)i_size )
964 msg_Dbg( p_this, "Invalid signature packet" );
968 int i_ret = parse_signature_packet( p_sig, p_buf+1+i_header_len, i_len );
970 if( i_ret != VLC_SUCCESS )
972 msg_Dbg( p_this, "Couldn't parse signature" );
976 if( p_sig->type != BINARY_SIGNATURE && p_sig->type != TEXT_SIGNATURE )
978 msg_Dbg( p_this, "Invalid signature type: %d", p_sig->type );
979 if( p_sig->version == 4 )
981 free( p_sig->specific.v4.hashed_data );
982 free( p_sig->specific.v4.unhashed_data );
990 #endif /* UPDATE_CHECK */